Summary - Data types

Combine integer, floating-point and string types to write a calculation card.

Summary - Data types

In this section you learned the basic C++ data types:

int, short, long, long long integer types
float, double, long double floating-point types
bool for true/false, char for single characters
std::string for text
sizeof to query memory size

Now you will combine these types in two tasks to reinforce what you learned.

Exercise Print three types

Add the #include <string> header. Inside main, declare an int (value 42), a double (value 3.14) and a std::string (value "Test"). Print all three in a single std::cout line with spaces (" ") between them and end with std::endl.

Show example solution

#include <iostream>
#include <string>

int main() {
    // Declare int, double and std::string
    int count = 42;
    double rate = 3.14;
    std::string name = "Test";
    // Print all three with std::cout
    std::cout << count << " " << rate << " " << name << std::endl;
    return 0;
}

Exercise Print a variable's size

Inside main, declare int value = 100;. Use sizeof(value) to print the byte size of value with std::cout using std::endl.

Show example solution

#include <iostream>

int main() {
    // Declare int value
    int value = 100;
    // Print the size of value with sizeof
    std::cout << sizeof(value) << std::endl;
    return 0;
}

Test yourself

Match types with categories

int

Integer
double

Floating-point
char

Character
std::string

Text

Querying size

std::cout << ____(double);

Show answer

std::cout << sizeof(double);

Next lesson: Project design

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